What’s the purpose ?

Answer:

About 512 g.

Explanation:

We are given a sample of P₂Cl₅ that contains 179 grams of phosphorus, and we want to determine the grams of chlroine that is present.

Thus, we can convert from grams of phosphorus to moles of phosphorus, moles of phosphorus to moles of chlorine, and moles of chlorine to grams of chlorine.

From the formula, there are two moles of P for every five moles of Cl. The molecular weights of P and Cl are 30.97 g/mol and 35.45 g/mol, respectively. Hence:

[tex]\displaystyle 179\text{ g P} \cdot \frac{1\text{ mol P}}{30.97\text{ g P}} \cdot \frac{5\text{ mol Cl}}{2\text{ mol P}} \cdot \frac{35.45\text{ g Cl}}{1\text{ mol Cl}} = 512\text{ g Cl}[/tex]

In conclusion, there is about 512 grams of chlorine present in the sample.

Alternatively, we can mass percentages. The mass percent of phosphorus in P₂Cl₅ is:

[tex]\displaystyle \% \text{P} = \frac{2(30.97)}{5(35.45) + 2(30.97)} = 25.90\%[/tex]

Because there are 179 grams of phosphorus, the total amount of sample present is:

[tex]\displaystyle \begin{aligned} 25.90\% \cdot m_T & = 179\text{ g P} \\ \\ m_T & = 691.1 \text{ g}\end{aligned}[/tex]

Therefore, the amount of chlorine present is 691.1 g - 179 g, or about 512 g, in agreement with our above answer.

Answer:

In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.

Explanation:

In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.

examples

diethyl ether and methyl propyl ethers are metamers.

Mass of H2CO3 = 1.05g

Givens: NaHCO3 = 3.24

Na2CO3 = 2.19

Mass of H2CO3 = mass of NaHCO3 - mass of Na2CO3

Mass of H2CO3 = 3.24g - 2.19g

Mass of H2CO3 = 1.05g

The number of protons and the number of neutrons combine to determine the mass number of an element. Mass number = proton + neutron. If you want to calculate the number of neutrons an atom has, you can simply subtract the number of protons or atomic numbers from the mass number.

Divide the mass of a substance in grams by the molecular weight. This will give you the number of moles of the substance in a particular mass. For 12 g of water, (25 g) / (18.015 g / mol) = 0.666 mol.

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Answer:

an increase in temperature

Explanation:

The chemical reaction that is produced by modelage masks causes: an increase in temperature

The result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595. Details about multiplication can be found below.

Multiplication is the process of computing the sum of a number with itself a specified number of times, or any other analogous binary operation that combines other mathematical objects.

Multiplication as an operation increases a number.

According to this question, the following expression is given: 0.0030 x 8.65 = 0.02595

Therefore, the result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595.

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The relationship between the enthalpy (ΔH) and entropy (ΔS) of a

reaction that is spontaneous at higher temperatures but not at lower

temperatures is +ΔH, - Δs.

The relationship between enthalpy (ΔH) and entropy (ΔS) is given by Gibs free energy.

ΔG = ΔH - TΔs

When ΔH < 0 and Δs < 0, ΔG = -ve  (-ΔH, - Δs) (for lower temperature)

Also, when ΔH < 0 and  Δs = +, ΔG = -ve (-ΔH, +Δs)  (for all temperature)

When ΔH > 0 and Δs < 0, ΔG = -ve  (+ΔH, - Δs) (for higher temperature)

Thus, the relationship between the enthalpy (ΔH) and entropy (ΔS) of a

reaction that is spontaneous at higher temperatures but not at lower

temperatures is +ΔH, - Δs.

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Answer:

alkenes and cyclic compounds

Answer:

Fluorine 1s2 2s2 2p5

Explanation:

it is likely to receive 1 electron

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In the periodic table, this element belongs to the 17th group. As a result, the element has a tendency to gain one electron during bond formation in order to achieve octet.

electronic configuration is:

[tex]1s^22s^22p^5[/tex]

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Answer:

More people means more demand for oil, gas, coal and other fuels mined or drilled from below the Earth's surface that, when burned, spew enough carbon dioxide (CO2) into the atmosphere to trap warm air inside like a greenhouse

Explanation:

hope this helps

pls mark brainliest

Answer:

AZ₂

Explanation:

The formed compound will not contain Q because mass percentages, %A and %B, form 100% of the compound.

Steps

Solving

Answer:

Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol

Explanation:

First, collect the individual molar masses of each element. These values are found on the periodic table under each respective element.

Chromium (Cr): 51.996 g/mol

Phosphorus (P): 30.974 g/mol

Oxygen (O): 15.999 g/mol

The quantity of each element is determined by the subscript next to it. If their is a subscript directly to the right of a set of parentheses, multiply each element within the parentheses by the subscript.

Chromium (Cr): 4

Phosphorus (P): 1 x 3 = 3

Oxygen (O): 4 x 3 = 12

Finally, the total molar mass of the compound is the collective molar masses of each element times the quantity of each element.

Molar Mass (Cr₄(PO₄)₃): 4(51.996 g/mol) + 3(30.974 g/mol) + 12(15.999 g/mol)

Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol

Answer:

True

Explanation:

I think it is common sense to assume that if we all came together to reduce our consumption then less resources would be harvested from envrionment and thus we would have positive impact on environment.

Answer: water

Explanation:

In aqueous solutions, water is the solvent.

Answer:

change of color

Explanation:

One or more of the following events can indicate that a chemical reaction has occurred: The reaction flask's interior has undergone a color shift. A change in color and the appearance of bubbles are two indications of a chemical shift. The correct option is B.

A large variety of various observable characteristics, such as color change, energy change (temperature change or light produced), gas production, precipitate formation, and property change, can be used to detect chemical reactions.

An indicator is a chemical substance that modifies color when an acid or base is present. Indicators are often mildly acidic or basic in nature and originate from plant pigments.

Thus the correct option is B.

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Answer:

Cation and anion.

Cation is a positive ion.

Anion is negative ion.

E.g.: NaCl, CaF2, KBr

Answer: between 6.5 and 8.5

Explanation:

As shown in my science book it appears in the ph scale

Answer:

Solvent

Explanation:

Solvent dissolves solute resulting in the formation of a solution.

Answer:

B) Solvent

Explanation:

In forming a solution, the substance which dissolves the solute is called the solvent.

The name of the carboxylic acid would be 2-methyl-3-ethylheptanoic acid.

Carboxylic acids are named based on the longest carbon chain and the counting starts from the carboxylic acid's functional group.

Thus, in this case, the compound would be a heptanoic acid because the longest chain towards the functional group has 7 carbons.

This means 2 branches exist in the compound. The first one has a single carbon while the second one has 2 carbon atoms. This means they are methyl and ethyl groups respectively.

The branches are located on the second and third carbon on the main chain. Thus the compound's name is 2-methyl-3-ethylheptanoic Acid.

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Answer:

Use energy sources that do not release greenhouse gases into the atmosphere.

Explanation:

If you use energy that does not release greenhouse gases such as CO2 then the heat won't be trapped in our environment, thus less chances of global warming. Option A is nonsense, B does not make sense either. C is the only valid way.

Answer:

lithium lithium (or 2lithium) + oxygen ->

Explanation:

Your welcome

The maximum amount, in grams, of Fe that would be produced during the experiment, will be 280 grams

From the equation of the reaction:

[tex]Fe_2O_3 + 2Al -- > 2Fe + Al_2O_3[/tex]

The mole ratio of [tex]Fe_2O_3[/tex] to Al is 1:2.

But 3 moles and 5 moles of reactants respectively started the reaction. Thus, Al is limited in availability and will determine the amount of products that will be produced.

The mole ratio of Al and Fe is 1:1, therefore, a maximum of 5 moles of Fe will be produced from the reaction.

5 moles Fe = 5 x 56 = 280 grams

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From the calculation, Q >K, the reaction proceeds towards the left and more reactants will form.

The term equilibrium constant refers to the value that could indicate the extent of conversion of reactants to products.

Thus, given that the equilibrium constant for the reaction  A₂(g) + B₂(g) = 2AB(g) is 6.2, the Qc is obtained from;

Qc = [0.60]^2/[0.20] [0.15]

Qc = 0.36/0.03

Qc = 12

Since Q >K, the reaction proceeds towards the left and more reactants will form.

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Answer:

You can get to the answer in two steps:

calculate: 3.40⋅1022 atoms = x mol ?

using Avogadro's constant.

calculate: x mol = ? grams,

using the atomic mass of Helium.

Step 1

Avogadro's constant says that 1 mole of any atom contains 6.022⋅1023 atoms. In this case you have 3.40⋅1022 atoms:

3.40⋅1022atoms6.022⋅1023atomsmol = 5.65⋅10−2mol

Step 2

The atomic mass of helium (He) will give you the weight of one mole of this molecule: 1 mol = 4.00 gram:

4.00gmol⋅5.65⋅10−2mol = 0.226g

So the 3.40⋅1022 helium atoms weigh 0.226 gram.

Answer:

pH = 2.38

Explanation:

Recall that HCl is a strong acid and hence dissociates completely into H⁺ and Cl⁻ ions. Thus, the solution's H⁺ concentration is equivalent to the acid concentration. That is, [H⁺] = 4.2 × 10⁻³ M.

Therefore, the pH of the solution is:

[tex]\displaystyle \begin{aligned}\text{pH} & = -\log[\text{H}^+] \\ \\ & = -\log (4.2\times 10^{-3}) \\ \\ & = 2.38\end{aligned}[/tex]

Answer:

HCl + H[tex]\\ 2[/tex]O —> Cl- + H[tex]\\ 3[/tex]O+

pH = -log [H[tex]\\ 3[/tex]O+] = -log [4.2 x 10^-3] = 2.38

—

We assume that hydrochloric acid will undergo complete dissociation in water to give stoichiometric H3O+ ion, according to the given reaction.

—

Have a nice day!!

Answer:

176g

Explanation:

Given :

moles = 5.5

molar mass (sulfur ) = 32u

given mass = ?

Solution:

mole = given mass/molar mass

5.5 = given mass/ 32

5.5×32=given mass

176 g = given mass

Answer:

Face value. Corporate bonds normally have a par value of $1,000, but this amount can be much greater for government bonds.

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